Learn the meaning, pronunciation and usage of the word influence , which can be a noun or a verb. Find out how to use influence in different contexts, such as effects, power, culture and alcohol. Learn the meaning of influence as a noun and a verb, with synonyms, antonyms, and idioms. See how influence is used in different contexts, such as business, politics, and social media. Influence is the power to have an important effect on someone or something. If someone influences someone else, they are changing a person or thing in an indirect but important way. influence (countable and uncountable, plural influences) The power to affect, control or manipulate something or someone; the ability to change the development of fluctuating things such as conduct, thoughts or decisions. quotations